Successfully complete the following tasks to get the corresponding ending:

Ending A - Good: Have your NSA trust above 33% and save at least two of the three targets (Crouse Ship, Hisham, Lambert).

Ending B - Normal: Have your NSA trust below 33% and save all three targets (Crouse Ship, Hisham, Lambert). Alternately, have your NSA trust above 33% and destroy two of the three targets.

Ending C - Bad: Destroy all three targets (Crouse Ship, Hisham, Lambert). Alternately, have your NSA trust below 33% and destroy two of the three targets.

Getting back to cell in Ellsworth Penitentiary

When you sneak out of your cell by crawling under the bed and getting the walkie-talkie, you must get back within the time limit. When you are up on the grating, instead of taking the pipe down drop off. You will knock out a guard. Then, go back to your cell and act normal. The grating is the only way down.

Bomb defusing in Okhotsk, Russia Part 2

In Mission 6: Okhotsk, Russia Part 2, after talking with the Captain he will reveal that he has rigged the bombs to go off. Emile Dufraisne will tell you that they are in the machine room. Look for a crawl space near you. Go through it and down the ladder. Once you are in the machine room, disrupt the light near to the ladder with your OPC and the camera that you will find nearby. Then, go to the first bomb (you will recognize them by a green light) on the same level as you are on. You can defuse them by cutting the wires in a particular order. The wire you have selected for cutting will be highlighted in green. You will know which wire to cut by a short vibration from the controller. When you select the wire the Captain will say that you now have three minutes. The rest of the bombs are located in the machine towers (two of them) and one is upstairs roughly opposite of the first bomb. Note: There are three guards in the room. It is recommended to quick save the game before attempting to defuse your first bomb so that you have an idea of how it is done.

Disposing Hisham's body

If you are going to kill Hisham, wait until he is down in the parking space. Kill him and pick up his body. Walk to the back of the red car and put him in the back. Press Place Charge and stand back. Detonate it and the "Opportunity Objective complete - Dispose of Hisham's body" will appear.

Defeating Emile

Make sure you have a flash and frag grenade and full life. There is a lifebox near the door outside of where Emile is on the right wall. Go outside to Emile and an intermission sequence will begin. Once it has finished, on your left may be a laser beam. Wait for it to go off. When the laser goes off and Emile is done shooting (he will begin again), roll to the next chair or bench. Wait until he is finished shooting again. Continue doing this and go up for the fence/rail. Jump onto it. Go down from it and then take Emile out. Walk away for one or two seconds, and make sure you can drop the flash grenade near Emile. Shortly after it is dropped, put your frag grenade in the same place. Emile will not see you drop it and will be defeated. Then, read the computer and defuse the bomb. Note: Take your time.

Comcast message

In Multiplayer mode, select either Xbox Live or System Link. Go to Co-Op Challenges, select "CodeName: Onyx", then Choose Mission 03. If you chose Xbox Live, make sure this is a private game so that you can host your own room. Press X to start the game. Go through the double doorway to the right of the gadget stock, then turn right at the stairs and walk up. On the wall will be a Comcast sign. Turn and go up the stairs once more and enter the room with the number "2" on the wall to the left of it. Once in the room, turn right to the first open window. Go all the way to the end of the walkway and jump to the landing directly in front of you. Climb up the ladder, stop, turn right until the camera is facing the building you just came from. Look up to see a huge Comcast billboard. Click the Right Analog-stick to view it from your goggles. D-pad Up zooms in, while D-pad Down zooms out.

Strange corpse in Shanghai Hotel

When you are trying to get to the safe in the meeting, after you pass the room with the man in the bathroom, hide behind the bar. Wait for someone to come through the door and sit down in the chair. Take aim and shoot him in the face. The body should glitch. His knees should be in the floor, and he will be standing perfectly straight but inside the chair.

Achievements

Accomplish the indicated achievement to get the corresponding number of Gamerscore points: